RELX interview questions

Applied online, significantly overqualified for the position but I assumed there might be opportunities for growth. The interview itself was simple and straightforward-- until they offered me the job on the spot but then never followed up afterwards? Definitely a bizarre experience, this office at least seems a bit disorganized/out of it. I wouldn't have wanted the job given the lacking professionalism-- not that I ever saw a real offer from HR! Two months later, the position is still listed on their website as unfilled and my application is "Under review."